Patent GB-191201624-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: FRIEDMAN LESLIE HAROLD
IPC: B41J19/74
Filed: 1912-01-20
Granted: 1913-01-16
Abstract: 1624. Friedman, L. H. Jan. 20. Carriage-returning mechanism.-Relates to arrangements wherein the carriage-driving spring is provided with reversing-mechanism for returning the carriage either automatically or under control of a carriage-return key, means being also provided whereby the spring is wound during the letter-spacing movement of the carriage. (1) The driving-spring 123, Fig. 21, is secured to a spindle 124 and to a loose drum 120 adapted to be clutched by teeth 121, 122 to loose drums 126, 133. The drum 126 is connected by a tape 130 to the right-hand end of the carriage, and the drum 133 is connected by a tape 136, Fig. 18, to a fusee 138 secured to a drum 140 which is connected by a tape to the left-hand end of the carriage. The drums 126 133 are alternately clutched to the drum 120 by means of levers 113, 116 engaging a slide 112 controlled from the carriage as described below, the arrangement being such that the drum 126 feeds the carriage for letterspacing and the drum 133 returns the carriage. When either of the drums 126, 133 is disconnected, a spring 129 or 201 prevents sagging of the idle tape. The slide 112 is moved by means of a lever 108 engaging a crank 106 on a shaft 104 provided with a pinion 103 engaging teeth 94 on a bar 86 mounted to slide in bearings 79, 81 on the frame. The shaft 104 is provided with a coiled spring which tends to move the bar 86 to the left (to the right in the rear views shown), the movement being normally prevented by a catch 91 pivoted in the bar and engaging a recess in a slide 83, which is held back by a spring 85. The carriage is provided with a rack 66 carrying adjustable tappets 70, 75 adapted to engage pivoted fingers 88, 99 in the bar 86, the finger 88 engaging the catch 91 and the finger 99 engaging a lever 96 which normally rests against a stop 102 and holds the finger below the level of the tappet. When the carriage reaches line-end, the tappet 70 engages the finger 88 and releases the catch 91, whereupon the shaft 104 turns and couples the drum 133 to return the carriage. At the end of the return movement, the tappet 75 engages the finger 99 and carries the bar 86 back to the initial position, thereby rotating the pinion 103 and coupling the drum 126 that moves the carriage for letter-spacing. The movement of the bar 86 continues until the finger 99 has been carried beneath the level of the tappet by the engagement of the lever 96 with the stops 102. The carriage-return key 178, Fig. 25, is used mainly for returning the carriage from mid-line positions, and is arranged to rock a shaft 186, Fig. 16, connected by link 189 to a finger 192 adapted to engage the lever 96 and thereby push the bar 86 endways to reverse the connexions, the key being held depressed during the whole of the return movement. The bar 86 is returned to the normal position by the spring 85 of the slide 83 which is held in engagement with the bar by means of the catch 91. (2) The winding-means for the spring 123 consists of a pawl 148, which engages a ratchet-wheel 144 on the spindle 124 and is carried by radius-arms 145 connected by a link 166 to a lever engaging the letter-spacing universal bar. To prevent over-winding of the spring, the detent 163 of the wheel 144 is arranged on excessive recoil to actuate a stop-arm 160 which prevents actuation of the winding-pawl 148. For this purpose the detent is carried by a lever 158 which engages with lost motion the stop-arm 160, this being in the form of a lever adapted to engage an extension of the arms 145. When the spring is fully wound, the recoil of the detent is sufficient to swing the arm 160 beneath the extension and thereby prevent the radius-arms 145 from being lifted far enough to re-engage the pawl 148 with the wheel 144. Line-spacing mechanism; space-key actions.- Automatic and key-actuated means of the following character are provided for actuating the usual line-spacing mechanism, comprising a pawl 32, Fig. 9, pivoted on a radius-arm 28 and connected by a link 35 to a lever 37 actuated through a link 45 by a line-space lever 48. The spacing is adjustable by means of the usual plate 25, which can be set by a pin 27 and is provided with a stop adapted to engage a cushioning-spring on the arm 28. For automatic line-spacing, the lever 37 is provided with a roller 43 adapted to ride over a fixed cam 50. The roller is carried by a pivoted finger 41 and wipes idly over the cam during the letterspacing movement of the carriage. For keyactuation, the lever 37 is operable by a link 52 carried by a lever 56 secured to a shaft 57, which is journaled in the carriage and is geared to a fluted roller 59 journaled in the framework. The roller is coupled by a link 62, Fig. 25, to the line-spacing key lever 64 which is pivoted on the carriage-return key lever 177 and connected thereto by a spring 179. When the carriage-return key 178 is depressed, it pushes down the line-spacing key-lever, the carriage being returned as described above and the line-spacing mechanism being operated through the link 62. When the line-spacing key 65 is depressed, the spring 179 yields, and the line-spacing mechanism is operated without operation of the carriage-returning mechanism. Margin stop.-The margins can be altered by adjusting the tappets 70, 75 on the rack 66, the tappets being, for this purpose, provided with spring-pressed catches 72, 77 adapted to engage the teeth of the rack.